Set of key buttons for a handset



FIG. 1 is a front view of a first embodiment of a set of key buttons for a handset showing our new design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a front view of a second embodiment of a set of key buttons for a handset showing our new design; and,

FIG. 4 is a perspective view thereof.

The broken line showing of environmental structures is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a set of key buttons for a handset, as shown and described. 